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Qin C.-H.,China Institute of Water Resources and Hydropower Research | Gan H.,China Institute of Water Resources and Hydropower Research | Zhang X.-J.,Beijing Hydraulic Research Institute | Jia L.,China Institute of Water Resources and Hydropower Research
Shuili Xuebao/Journal of Hydraulic Engineering

Based on the connotation analysis of the value of water resources, the theory and practice study for price of water resources were developed. The supply price of water resources should be composed of water resources fee, cost of supply and environment compensation fee for water. Demand price of water resources should be determined by economic value of water resources. Market price of water resources should be determined by provide price and demand price, and it could be evaluated by shadow price in non-marketization system. According to the equilibrium relation of water price, quantitative evaluation method for water resources fee was put forward. Based on the simplified CGE model and related methods, some key factors were quantitatively evaluated, such as shadow price, economic value, water resources fee, supply cost and environment compensation fee for water. The output of this study will provide theory support for pricing mechanism of water resources and practice support for pricing standard. The achievements are significant for practicing most strict water resources management, setting up price mechanism of water resources, allocating water resources by price lever. Source

Fang H.,Tsinghua University | He G.,Tsinghua University | Wang L.,Beijing Hydraulic Research Institute
Journal of Hydraulic Engineering

This note, using a three-dimensional model of river flow and sediment transport, examines the effect of the vertical resolution and the choice a nonequilibrium adaptation length Ls in predicting flow and sediment transport around groins in China's Yongding River. The results show that a fine vertical grid and nonequilibrium sediment transport model provide good predictions, especially on the river bed profile with an obvious main channel and flood plain. © 2010 ASCE. Source

Liu L.,Beijing Normal University | Xu Z.-X.,Beijing Normal University | Huang J.-X.,Beijing Normal University | Huang J.-X.,Beijing Hydraulic Research Institute
Stochastic Environmental Research and Risk Assessment

Long-term trend and abrupt changes of major climate variables in the Taihu Basin were investigated based on the mean, maximum and minimum air temperature, diurnal temperature range (DTR), precipitation, relative humidity and sunshine duration at six meteorological stations from 1954 to 2006. Results showed that the long-term trend for annual precipitation was not statistically significant during the past 53 years, but a wetter tendency was detected and the increasing centre for annual precipitation was located in the southeast of the study area. Mean air temperature has increased by 1.43°C, similar trends were also identified for maximum and minimum air temperature, which have increased by 1.06 and 1.54°C, respectively, while DTR exhibited a slight decreasing trend with a rate of about -0.09°C/(10 year). The annual mean relative humidity and sunshine duration exhibited a decreasing trend, with Kendall slope values of -0.99%/10 year and -7.797 h/10 year, respectively. Examination of long-range dependence showed that all climate variables exhibited strong persistence at annual scale except minimum air temperature. Detection of abrupt changes using nonparametric Mann-Kendall and Pettitt methods showed different results. Abrupt changes occurred in the 1980s and 2000s for annual precipitation using the nonparametric Mann-Kendall method, while no abrupt changes were detected using the Pettitt method. Abrupt changes of temperature and relative humidity took place in the early 1990s using the nonparametric Mann-Kendall method, which occurred in the late and mid 1980s using the Pettitt method, while abrupt changes of sunshine duration and DTR detected by two methods occurred in the similar period. The result will be helpful for local flood control and drought relief in urban planning and construction under future global climate change. © 2011 Springer-Verlag. Source

Yu Y.T.,Institute of Strategy and Policy Naval of Armament | Ding Y.,Beijing Sino Ocean JIYE Property Management CO. | Ding Z.X.,Beijing Hydraulic Research Institute
Applied Mechanics and Materials

The sea-battlefield situation is dynamic and how efficient sea-battlefield situation assessment is a major problem facing operational decision support. According to research based on Bayesian networks Sea-battlefield situation assessment, first constructed sea-battlefield situation assessment Bayesian network; followed by specific assessment objectives, to simplify creating sub Bayesian assessment model; once again based on Bayesian network characteristics to determine each node probability formula; finally, according to the formula for solving the edge of the probability and the conditional probability of each node, sea-battlefield situation assessment. © (2013) Trans Tech Publications, Switzerland. Source

Liang J.,CAS Research Center for Eco Environmental Sciences | Liang J.,Beijing Hydraulic Research Institute | Yang Q.,University of La Coruna | Yang Q.,Wuhan University | And 2 more authors.
Energy and Buildings

The use of groundwater for cooling and heating purposes is of interest from both the economical and the ecological perspective. The groundwater heat pump (GWHP) system utilizes groundwater as alternative renewable and clean energy source for space heating and/or cooling, withdraws water from a production well, passes it through a heat exchanger and discharges the water into an injection well. By utilizing the relatively stable temperature of groundwater, GWHP system can achieve a higher coefficient of performance. Due to the utilization of groundwater stored in the aquifer, the assessment of the hydraulic capacity of the aquifer based on numerical groundwater models is always needed for the optimum design and the efficient performance of GWHP. In this paper, numerical methods of underground heat-water transfer, energy balance method and thermal storage method were presented to calculate the capacity of unit area of shallow groundwater aquifer. The model results indicate that the numerical method, which is based on performance efficiency of GWHP, represents the behaviour of groundwater pumping/recharging processes, and serves better than energy balance method and thermal storage method, in addition it has been proven itself that this method has the advantages of energy saving and environmental protection. The calculated capacity is positively related to aquifer thickness. It is found that it is easy for ground water recharge in alluvial and pluvial fan located at the piedmont, while the calculated capacity is relatively smaller compared with that of south-east plain where it is not easy for groundwater recharge. © 2011 Elsevier B.V. All rights reserved. Source

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